% APNIC found the following authoritative answer from: whois.ripe.net

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '212.23.103.1 - 212.23.103.255'

% Abuse contact for '212.23.103.1 - 212.23.103.255' is 'abuse.de@telefonica.com'

inetnum:        212.23.103.1 - 212.23.103.255
netname:        EP-PAT-POOL-1
descr:          Dyn Pat Pool for Handhelds
country:        DE
admin-c:        EAG18-RIPE
tech-c:         EAG18-RIPE
status:         ASSIGNED PA
mnt-by:         AS12638-MNT
created:        2011-01-31T15:32:25Z
last-modified:  2011-01-31T15:32:25Z
source:         RIPE

role:           E-PLUS ADMIN GROUP
abuse-mailbox:  hostmaster@eplus-gruppe.de
address:        Germany 40472 Duesseldorf E-Plus Strasse 1
remarks:        legal requests : +491774481122
admin-c:        JL8-RIPE
tech-c:         JL8-RIPE
nic-hdl:        EAG18-RIPE
mnt-by:         AS12638-MNT
created:        2010-01-20T16:08:42Z
last-modified:  2015-12-10T15:50:28Z
source:         RIPE # Filtered

% Information related to '212.23.96.0/19AS12638'

route:          212.23.96.0/19
descr:          E-PLUS
origin:         AS12638
mnt-by:         AS12638-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2001-09-22T09:33:02Z
source:         RIPE

% Information related to '212.23.96.0/19AS6805'

route:          212.23.96.0/19
descr:          Telefonica Germany GmbH & Co. OHG
remarks:        netname: DE-MEDIAWAYS
origin:         AS6805
mnt-by:         MDA-Z
created:        2018-08-08T09:02:49Z
last-modified:  2018-08-08T09:12:38Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.120 (ABERDEEN)